Flow and Combustion in a Supersonic Cavity Flameholder

Esteban Cisneros-Garibay, Carlos Pantano, Jonathan B. Freund

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Detailed numerical simulations of both inert mixing and sustained combustion are analyzed for a cavity flameholder based on corresponding experiments. A M = 1 round ethylene jet fuels a cavity with length-to-depth ratio L/D = 3.5 and a 45 inclined downstream wall. Oxidizer mixes into the cavity from the M = 3 core flow. The simulations reproduce shock angles and wall pressures of the corresponding experiment. The effects that cavity combustion has on the core-flow gas dynamics and cavity entrainment are analyzed in detail. Relative to the inert case, heat release leads to a complex core flow, with upstream boundary layers transiently separating and highly unsteady shocks over the cavity. Their collective effect is the formation of a virtual throat, which decreases the core flow to M = 2 above the cavity. Lagrangian trajectories assess the roles that turbulence, combustion, and three-dimensional side-wall boundary layers have on oxidizer entrainment into cavity entrainment. Overall, sustained cavity combustion suppresses entrainment by a factor of about 2.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum 2022
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106316
DOIs
StatePublished - 2022
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022 - San Diego, United States
Duration: Jan 3 2022Jan 7 2022

Publication series

NameAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
Country/TerritoryUnited States
CitySan Diego
Period1/3/221/7/22

ASJC Scopus subject areas

  • Aerospace Engineering

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